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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766a7bd3a3fc7ef0567b8e2b9bdfb6520fae92481ae4b0822d2c2aecd8430f90' 
  AND token = 'eF6OZfk2rKgCOtu95qaUg0kxAXvU9cSaMTTwG2abiPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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