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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e00b59374ef20ddd4fa05a196b5cafb5efaa099de36b37b857ac98b62e25e3' 
  AND token = 'wXR2ugW4pkCmJngSSl54+r6l7fXJU3xH6st6bhXHgIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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