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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13046bc56eb5bd05a28d4e49087b2a301095c72170685c2fd1289181c7d1c220' 
  AND token = 'KrA9rG5eHmqOj1UE62W5Wpk6fkgKQbsG6//+iIeY8pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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