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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f047175a1c4e2180c156374e0f7f98424cd196a63264eb75f4a14056951fa454' 
  AND token = 'iVm/t2/vbxY5TqbFvVmxAW8rV6QI2eDMzb5ajVflNNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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