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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b01b37c138fea0e54a87ce6aa013f38b9201f638a08d45c8bf7ce22ff3736b' 
  AND token = 'iKf1i6nz0q+gmn3OdWab+jwgjRrhwm6YCGhEFxINBYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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