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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0554d1a616b3afbe05765d27825482ce6fedae68a62ce4b09dafa4767a4b9c' 
  AND token = '4FmAWwie3G04KNYdBc0l5+z9I8DlQXOQ2QauxR8a1yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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