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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfeb13e00b1372cfc1a1bfaeb9f414740b03d8757e34a41e9f2fdd9105c26ee8' 
  AND token = 'L5r2qL6x9M4TB8UY9dvX75i7p20izZUY8KcxE2qOrGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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