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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b9b19cd1139901c97395cd2dde0a669e4b5cb0c07cb3a1957cdf9b3ef0a928' 
  AND token = 'o7nROTQ1MKSVbGOy3eAiU3D6Tc7ispvpZvrpw2N0Hck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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