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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54facff443d1e2e7179aa9e63168776b9ce6015f8c63f17b3e583c4f9bfff52d' 
  AND token = 'b2m3lcPZucY1rCl6NMzYKE3ubIsjTMEAbPVNfu72c9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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