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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a71734a6afd91cfb9f675ad32855a5ee392b1e96682da8292e087803fbe4bad' 
  AND token = 'XFH5THufvGCKKftH5dzE1nwsfh5mAeW7U3rOtxtiKgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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