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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1315553b752e0c7f396b744235c121f4ffe1094efc7f819f2a7c83f27bbfa83a' 
  AND token = 'Umoe75aPsEDwBjnK/T50ztkKyYwMMp0O7vYkURZ5FX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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