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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554435f6e04bfc51529c3b399c82b5aa82c463dca087e4c8fd229fac1b202b93' 
  AND token = 'cBxuRbT4mrncKb8TG58i0uNvOVkoQYib/u++uofZoYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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