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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563596e44471ff2d4faf3486c95589772204768d59529f75f9569d58885f2866' 
  AND token = '52J/kH6sb8MyZLyZjHVgGXZE7cUDsoSy2kxZpuQapw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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