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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b9ec2e936b3d8126297d14a50fdeb6d0cfff7156c445326f954744c2f0fcc3' 
  AND token = 'f5IA5qkcc80qtoVqfoO6PrIP2turCHfu663o04phuD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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