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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32bcce73ea87b0fbb8022dd2a3ef123158e94a64653626cca5cf41acacdfcc6' 
  AND token = 'D1lM21xuR1+zjZcZq/t8WvEBZTctTV5lERgZC4sf4fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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