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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8a6308ec070648d279224a60d3ff6ea50a1126fdb1a21ca91b61357168e3a4' 
  AND token = '/c8VdQC6bTqoIDvMOnJ4ksFmhv7Pc5rSvFn93ews+XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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