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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecad9b69aebb12c9b88fdc19ccfd06db448c7cc2164dfb0c3fea8dd207a7daf' 
  AND token = 'OEgGiekttmxM58cJxihGkSVhxI1uTcsN2w+OujNn0cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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