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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f25bf3fcf08bdf25b6843b9939d16e8cd45df40735fd47c02faa966c1e3b3f' 
  AND token = 'vsb3yMNLOAQwWkvHlF3xwiJv0enRjGYyp+oSi/HmCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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