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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e27fc3ea85f2341442e8183db888d66064d624c9787ced0eb662e08f40b658e' 
  AND token = 'cRGw4pUnAKoKtoHDeljDZoDmxb2vbH9PU/EF7ElF17A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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