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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55999082d74fcad7092196e3e39c1af5b221425bd87521ece177a8a904c2e8c' 
  AND token = 'MKDmEjlDPQAnqxhAMeRM938yB10dWuDBiMslH8zUNBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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