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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531948a652dd4daa511a1045a1efe8edf5c76495a870bf2e11ea06988ee18a1c' 
  AND token = 'WZa0Cx1Q17EBUcwoBQA5bc0bnH7z1ru45jSnz2CVtGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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