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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8149a9f67636991bc5d76c3205b40b5cc8f464e416d304a4288a28808422b96d' 
  AND token = 'jolW3LDi0FttTYE2oZ1miJ8PLedD4+NIq13c5ZTyOtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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