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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '645ed7d27ca94e1ae6cf6ed90498abd627d567cfc9dc760efe94b173e1c8924d' 
  AND token = '3qhssoOklpXw04ZqFG2U4HQDV5JaiqkA8NTTV+F/WhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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