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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b0532d869c5dd680f35aa585e47547d3ca300796d8eff174ebf791710a2b13' 
  AND token = '2asYXU+T4r11JUIPtwNNUVyYE+XVI9FNdkHreo1y4RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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