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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1caa122b988914d71047949949d2ca85d79ee8e6b0f8773485d06ed986b1c5' 
  AND token = 'bDTNGPjpSEn+VNJRH1i2wrE7g2VOXi1XZvJZesYm6X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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