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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744f1bb90ca8a36b73e9779b2b19487881ea706f6e0feffaf079ae610a0896d5' 
  AND token = 'z7L0Vu5JACtSlKsWRCzgVqNDX4PlFe+jjy0SALSiYKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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