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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d308976fa029f7d0a9595fc3b6c4359ebcb5f671458aae0512a61ca76f9ef5' 
  AND token = 'THkT/v0OB04zbB8MNd9K2/EJG6O6mos23n3Qy4pWK0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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