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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80942e5708899abbcb602b17ea02adfd8eb644ccf4e6ef386673ddc0b012f100' 
  AND token = 'kjvGdz2PuoTJ/Z2rSI6X5jPU2C8SwEVBCjAy66r9Rq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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