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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dc97258a7cef5d86edda99ea0ac5c98fd2ab4623aab22fa793895e87330d96' 
  AND token = '9PtldoTHJkIxiCTCzRRQzVhdJyHgQ8Z3p2l2NAT9GFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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