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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8069d9c40c4e9a487555cdf376729cf1f1577648efb30342058421b0d5419f5' 
  AND token = 'rMabA2YY32I+Jmhq93if0su3VO88DB5m0XwVQhy0Uhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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