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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f396b92fd5a02ad914c593c8b2e672a119501e64cc056d0086cb5d9a8d4c57e' 
  AND token = 'o2y79UzlYwg5VQo7icHGuZDKAw+VH/o1Vgu6145R5uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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