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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3726e63126ef2555c8e913e8f41343292f126c55ecc7966fb8ca8cade4169e4d' 
  AND token = 'c9riuAq6t0wUfi/Y7w1Ac1w4bjhPML7c2A07y+pniws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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