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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c413bca005ee8e4e674aabdd012210f31371af57c6cfc8b3750fc598a191588f' 
  AND token = 'e6aLkzHM5GdUDGbTI3pjvphhVF4ac9qMfn8XwUSXW90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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