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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b93e09a49e4c18b80d40d2c7fab92abc1fc4dc0a7b54439c3508266303e7e5a' 
  AND token = '51CuKkLX4CuPmAyli2jcd5kc7tU2E7Nq2MyA9NB5ZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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