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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d2b3058ac2fc4977647e8a7e9bcfe1ded4292ca4a04408a061b3eecdeacc42' 
  AND token = 'BMJbZM+tkt/x449WKmA5Yu+THlVgOtr1ht61NU92by4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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