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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce09f1218db0d9fe3b8f4c33da13076ade35dbf99b5cd049aa68ce2f32185360' 
  AND token = 'daOO1w1VRlI/lJ1TeImhcdfn/MdS3v4n7dmi//E5owY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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