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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6878080b529b3edb8edf5d46cdb237958545ea94c80d4461910ae237cb38ca56' 
  AND token = '0rlIQnDbJToHi1EyJv3mlpTHz3wc2aETIJolZehG7ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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