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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8322b96e966c59ae5cd86f61ea59cf222d98122ec676e128e53c166e771d0975' 
  AND token = '3zhiaQxKPZCbu/zOhrEyiCSCxhtFBpD3y37P3d1Fb+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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