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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfb4e7f3ba5664c2b37ba26648c8865030d26997568fd9349073e34628ab853' 
  AND token = 'bJIFs08SbLqFe42bEv595fZFS39fJTGk+PHonxtS3qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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