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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455bf6bca6b9017f59a99e05bc56e12bf21ac94b8546d887fcf42b6a085691da' 
  AND token = '04O/4RLWaUIbH61/96TwPoSsa/R2EH24h5mshV1yKmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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