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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7762d42058cc81664bcab1f5aa371a1b6b143b49a1af4ca9f8cb6bd14300138b' 
  AND token = 'r3/fef9bLXgWlxFRIOUBY6Zo/rS6OeDps0tE6QUYbHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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