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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb496b21755965f61933fc8dcd118638195f2869c09f360ffea1a26a9584d09' 
  AND token = 'HBogDUvQtH1w8IW3XCanG9O16y3FPjsIixK/p2PP5UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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