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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f361742aee1c90ea1432b2be6d1481a17f240b44d8bdd39c7745732c7fd646' 
  AND token = '0xVyeQ6H1CybbFfIm9tjx0jbAB/LHqY6vRC8KgSzFKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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