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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13369f53c3af0ea9dfd55e34891c812675442a6574348d2455a3f97b3d7e2ec8' 
  AND token = '+u4aKoJWlfp1DG8GSzqs1umZn+l0+4HUpg/p2MW1M9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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