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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603ac0a42d84cca6970a0462eec00964bc64edbf4c66b9c9650f547697bb7f37' 
  AND token = 'jeUrd86J+yPmCShRiRa9BZwIzQjDTe563lw4OZVfuxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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