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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d37f0b3e4919871f41812397a8429580870813e268038e07f3e4e2a1c781f2a' 
  AND token = 'CLyssRl9d81zLSN6ChtPeNaxv0Wa8l+dEaEBKVx9nz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}