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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ed4c744570f8eba8278253834a47026d6a9d796d8a08bf35b7dcd19fb1c19a' 
  AND token = 'C85zoV+XctfwotspBnWzo5d+r4EGzw41qli0vTo8t6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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