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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7756317dd7f127c1ffdd580624cde698858a732007e0fee9e8544701873d6cd5' 
  AND token = 'TqOtgGKD4tR3W8aLr76FOvwpj8RAuE4tzMzoNgPX9UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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