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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce53e9d489cf84d4239cae064ed7cfa4b0e78587b8d23d867d2ebfb6be5aeb32' 
  AND token = '8QDROBR8dnIiZ/3J2dCK32bHixKds17dV5lCj5S+IE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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