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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a518bb75670573e63889e3c0df49f225be4aba9f2c17eda8d593cdaa8a5da5' 
  AND token = 'ygP7Y2zn90I71HDT926LzmlZXY0H+k8yx+SfnOnRgDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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