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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7029e048be7e79049c3eb2a24fa0eb817578750f4235a4b403333d93f72818be' 
  AND token = '7XdYjOyGBOejvhncahK7SItiuuYVfrFNzTb/A+2hmOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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