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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f31852903fdd2f4a75e12932aaa86a82b094fde1d1e22dd2962a56e6a7ff1d' 
  AND token = 'xz0B2neTHx0td1c+4dwu3dkpiIbhweGaqtgR9sOHTc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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